scholarly journals SEISMIC RETROFITTING OF REINFORCED CONCRETE SHEAR WALL USING CARBON FIBER REINFORCED POLYMERS (CFRP)

2020 ◽  
Vol 15 (12) ◽  
Author(s):  
Shahzad Khan
Keyword(s):  
Shear Wall ◽  
Seismic Retrofitting ◽  
Fiber Reinforced Polymers ◽  
Carbon Fiber Reinforced Polymers ◽  
Reinforced Polymers ◽  
Reinforced Polymer ◽  
Before And After ◽  
Carbon Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Constant Axial Load

In this paper, the experimental results of a partially retrofitted non-compliant with code concrete shear wall using uni-directional carbon fibre reinforced polymer (CFRP) are introduced. The common deficiencies in the wall were insufficient reinforcement, un-confinement at boundary zone, the lake of in-plane stiffness, and ductility. The adopted retrofitting technique consists of the CFRP strips bonded to both wall face with mesh anchors installed in the wall panel and foundation to avoid debonding. The wall was tested before and after retrofitting under a constant axial load, and the displacement control lateral cyclic load was applied to the head beam level. The retrofitted wall showed satisfactory results in terms of drift and shear strength. The test results include the failure pattern, load-displacement behaviours, and deflected shape.

Strengthening with Prestressed CFRP Strips of Box Girders on the Chofu Bridge, Japan

2010 ◽  
pp. 21-34
Author(s):  
Masami Fujita ◽  
Terumitsu Takahashi ◽  
Kazuhiro Kuzume ◽  
Tamon Ueda ◽  
Akira Kobayashi
Keyword(s):  
Reinforced Concrete ◽  
Carbon Fibre ◽  
Box Girders ◽  
Strip Method ◽  
Reinforced Polymer ◽  
Before And After ◽  
Carbon Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Load Tests ◽  
Cfrp Strip

<p>Reinforced concrete (RC) box girders of the Chofu Bridge had been strengthened using tensioned carbon fibre reinforced polymer (CFRP) strip method. Before and after the CFRP application, on-site load tests of the bridge were conducted using a 45 t weight vehicle.</p>

Impact of resin-rich layer on the through-thickness resistivity of carbon fiber reinforced polymers

2019 ◽  
Vol 53 (24) ◽  
pp. 3469-3481
Author(s):  
Hong Yu ◽  
Suresh Advani ◽  
Dirk Heider
Keyword(s):  
Carbon Fiber ◽  
Electrical Conduction ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced Polymers ◽  
Carbon Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced Polymers ◽  
Reinforced Polymers ◽  
Reinforced Polymer ◽  
Carbon Fiber Reinforced

Increasing applications of carbon fiber reinforced polymers exploiting its electrical properties demand a good understanding of the electrical conduction mechanisms of carbon fiber reinforced polymer. Resin-rich interface, which is not uncommon to exist between composite laminae, not only affect the mechanical properties, but also the electrical conduction behavior. This study focuses on the impact of resin-rich layer on the through-thickness resistivity of carbon fiber reinforced polymer. Electrical characterizations are carried out on dry fiber tow systems as well as cured composites. Through-thickness resistivity changes of dry fibers with the sizing are compared against fibers without the sizing layer, and cured composites with added resin-rich layer against the composite laminates without the resin-rich layer. A localized Joule heating theory is proposed to explain the difference in the electrical responses. The theoretical and experimental investigations should prove useful for the development of quantitative models with Joule heating to describe electrical resistivity behavior of carbon fiber reinforced polymer.

Mode II interlaminar fracture toughness of unidirectional fiber-reinforced polymer matrix composites with synthetic boehmite nanosheets at room temperature and low temperature

2017 ◽  
Vol 52 (7) ◽  
pp. 945-952 ◽  
Author(s):  
Xin Liu ◽  
Tao Sun ◽  
Zhanjun Wu ◽  
Huiyong He
Keyword(s):  
Fracture Toughness ◽  
Carbon Fiber ◽  
Fiber Reinforced Polymers ◽  
Interlaminar Fracture Toughness ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced Polymers ◽  
Reinforced Polymers ◽  
Interlaminar Fracture ◽  
Reinforced Polymer ◽  
Carbon Fiber Reinforced

The nanosheet boehmite (AlOOH) was synthesized and used as reinforcing agent to toughen carbon fiber-reinforced polymers. The purity, morphology, size and composition of the AlOOH nanosheets were investigated by the methods of XRD, SEM, TEM and FTIR, respectively. Interlaminar fracture toughness for mode II deformation was investigated for carbon fiber-reinforced polymers toughened by AlOOH nanosheets varying the contents at room temperature (RT, 293k) and at low temperature (LT, 77k). The fracture surfaces were examined by SEM to correlate with the interlaminar fracture properties. The results indicated that the synthesized AlOOH nanosheets were pure crystalline and of high purity. By TEM, the thickness of the lamellar AlOOH sample is about 22 nm. The end-notched flexure test results show that interlaminar fracture toughness of unidirectional carbon fiber-reinforced polymer with the same content AlOOH nanosheets (0, 1, 1.5, 2, 2.5, 3 wt.%) at LT is higher than that at RT. The interlaminar fracture toughness reaches the highest when the AlOOH nanosheets content equals 2% at RT. But at LT, the highest interlaminar fracture toughness appeared in the carbon fiber-reinforced polymers without AlOOH nanosheets.

Strengthening of casilina bridge with carbon fibre reinforced polymer sheets

2002 ◽  
Vol 216 (3) ◽  
pp. 157-165 ◽  
Author(s):  
M Arduini ◽  
P Napolitano ◽  
R Gottardo
Keyword(s):  
Construction Time ◽  
Reinforced Polymers ◽  
Advanced Composite ◽  
Reinforced Polymer ◽  
High Durability ◽  
Advanced Composite Materials ◽  
Polymer Sheets ◽  
Carbon Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Design Aspect

Advanced composite materials [fibre-reinforced polymers (FRP)] are becoming one of the major innovations in the construction field. After a relatively short research phase, they are now commonly used for repair and strengthening for many types of structure. The keys to the success of this technology are the reduction in labour cost, the speed of the application and the high durability of the system. This paper presents the largest FRP application carried out in Italy in 1999. The structure is a 30 year old, two-span, reinforced concrete (RC) bridge. Beams were reinforced in bending and columns in shear and confinement. The design aspect and working schedule are included in the paper, as well as indication of the construction time schedule in order to verify the assumption of lower cost in a real situation.

scholarly journals Galvanically Stimulated Degradation of Carbon-Fiber Reinforced Polymer Composites: A Critical Review

Materials ◽  
2019 ◽  
Vol 12 (4) ◽  
pp. 651 ◽  
Author(s):  
Stanley Ofoegbu ◽  
Mário Ferreira ◽  
Mikhail Zheludkevich
Keyword(s):  
Carbon Fiber ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced Polymers ◽  
Fiber Reinforced ◽  
Galvanic Coupling ◽  
Carbon Fiber Reinforced Polymers ◽  
Reinforced Polymers ◽  
Reinforced Polymer ◽  
Fiber Reinforced Polymer Composites ◽  
Carbon Fiber Reinforced

Carbon is used as a reinforcing phase in carbon-fiber reinforced polymer composites employed in aeronautical and other technological applications. Under polarization in aqueous media, which can occur on galvanic coupling of carbon-fiber reinforced polymers (CFRP) with metals in multi-material structures, degradation of the composite occurs. These degradative processes are intimately linked with the electrically conductive nature and surface chemistry of carbon. This review highlights the potential corrosion challenges in multi-material combinations containing carbon-fiber reinforced polymers, the surface chemistry of carbon, its plausible effects on the electrochemical activity of carbon, and consequently the degradation processes on carbon-fiber reinforced polymers. The implications of the emerging use of conductive nano-fillers (carbon nanotubes and carbon nanofibers) in the modification of CFRPs on galvanically stimulated degradation of CFRP is accentuated. The problem of galvanic coupling of CFRP with selected metals is set into perspective, and insights on potential methods for mitigation and monitoring the degradative processes in these composites are highlighted.

Sign in / Sign up

Export Citation Format

Share Document